<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    {{name}}
    <br>
    <input type="number" v-model="age">
    {{age}}
  </div>
  <script src="./reactive.js"></script>
  <script>
    const app = new myVue({
      el:"#app",
      data:{
        name:"cky",
        age:18
      }
    })
  </script>
</body>
</html>